I'd say he's a tyrant from what I gather. Not in the modern day, evil sense, but in the ancient Greek definition (not necessarily an evil thing). He does have advisers, and he is the crowned emperor of Cyrodiil, and only Cyrodiil. With the way things are, I'd say he's trying to just bring law and order to an otherwise lawless Cyrodiil, and protect its borders from Thalamor terrorists coming from Valenwood. He does have his version of the CIA out and about, and does use them to assassinate people who could try to undermine his rule. The situation in Cyrodiil is very shaky.
Also, the Septim line is dead. Dead, dead, dead, dead, dead. Titus Mede was the only guy with the balls to take a look at the situation, and realize that 400 years of constant chaos wasn't a good way to go, like in the 2nd era. So, he rallied up his Colovian warband, and began to try and unite Cyrodiil once again.